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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18440e0e8823d48cff7f2c0076c2209a2f090ec2e3ff64eb901d399a078c87c' 
  AND token = 'XQENi197Ln0s8rKtACg1F2iCIDbebrvGDLs8skdjqss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}